svn commit: r298789 - in head/sys: kern sys

[Pedro F. Giffuni]

Author: pfg
Date: Fri Apr 29 16:32:28 2016
New Revision: 298789
URL: https://svnweb.freebsd.org/changeset/base/298789

Log:
  bufs: make B_DIRTY and B_PERSISTENT flags available
  
  It appears these flags were related to ext2fs but are completely
  unused nowadays. Retire them.
  
  Suggested by: mckusick

Modified:
  head/sys/kern/vfs_bio.c
  head/sys/sys/buf.h

Modified: head/sys/kern/vfs_bio.c
==============================================================================
--- head/sys/kern/vfs_bio.c	Fri Apr 29 16:07:25 2016	(r298788)
+++ head/sys/kern/vfs_bio.c	Fri Apr 29 16:32:28 2016	(r298789)
@@ -1162,8 +1162,7 @@ vfs_buf_check_unmapped(struct buf *bp)
 static int
 isbufbusy(struct buf *bp)
 {
-	if (((bp->b_flags & (B_INVAL | B_PERSISTENT)) == 0 &&
-	    BUF_ISLOCKED(bp)) ||
+	if (((bp->b_flags & B_INVAL) == 0 && BUF_ISLOCKED(bp)) ||
 	    ((bp->b_flags & (B_DELWRI | B_INVAL)) == B_DELWRI))
 		return (1);
 	return (0);

Modified: head/sys/sys/buf.h
==============================================================================
--- head/sys/sys/buf.h	Fri Apr 29 16:07:25 2016	(r298788)
+++ head/sys/sys/buf.h	Fri Apr 29 16:32:28 2016	(r298789)
@@ -200,7 +200,7 @@ struct buf {
 #define	B_CACHE		0x00000020	/* Bread found us in the cache. */
 #define	B_VALIDSUSPWRT	0x00000040	/* Valid write during suspension. */
 #define	B_DELWRI	0x00000080	/* Delay I/O until buffer reused. */
-#define	B_PERSISTENT	0x00000100	/* Perm. ref'ed while EXT2FS mounted. */
+#define	B_00000100	0x00000100	/* Available flag. */
 #define	B_DONE		0x00000200	/* I/O completed. */
 #define	B_EINTR		0x00000400	/* I/O was interrupted */
 #define	B_NOREUSE	0x00000800	/* Contents not reused once released. */
@@ -213,7 +213,7 @@ struct buf {
 #define	B_00040000	0x00040000	/* Available flag. */
 #define	B_00080000	0x00080000	/* Available flag. */
 #define	B_00100000	0x00100000	/* Available flag. */
-#define	B_DIRTY		0x00200000	/* Needs writing later (in EXT2FS). */
+#define	B_00200000	0x00200000	/* Available flag. */
 #define	B_RELBUF	0x00400000	/* Release VMIO buffer. */
 #define	B_FS_FLAG1	0x00800000	/* Available flag for FS use. */
 #define	B_NOCOPY	0x01000000	/* Don't copy-on-write this buf. */